The Influence of Annealing on Microstructure and Microhardness of Twin-roll Cast Al-Mg-Sc-Zr Alloy

Cieslar, Miroslav; Bajer, Jan; Šlapáková, Michaela; Křivská, Barbora; Zimina, Mariia; Stolbchenko, Mykhailo; Grydin, Olexandr

doi:10.12693/aphyspola.134.145

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Annealing of the twin-roll cast material for 8 hours at 300 • C leads to precipitation of dense distribution of Al 3 (Sc,Zr) [17]. The optimal conditions for their formation were found in our previous work [16] -the highest increase in the microhardness was observed after annealing at 300 • C; furthermore, the precipitates diameter was smaller than after annealing at 350 or 400 • C which ensures higher pinning force acting against recrystallization. In the twin-roll cast material the Vickers microhardness increases from initial ∼75 HV for the as-cast material to ∼100 HV for the annealed one [16].…”

Section: Resultsmentioning

confidence: 76%

“…The optimal conditions for their formation were found in our previous work [16] -the highest increase in the microhardness was observed after annealing at 300 • C; furthermore, the precipitates diameter was smaller than after annealing at 350 or 400 • C which ensures higher pinning force acting against recrystallization. In the twin-roll cast material the Vickers microhardness increases from initial ∼75 HV for the as-cast material to ∼100 HV for the annealed one [16]. Deformation by equal channel angular pressing of the twin-roll cast material causes fragmentation of the original grains to micrometric range - Fig.…”

Section: Resultsmentioning

confidence: 77%

“…In order to precipitate a dense distribution of fine coherent Al 3 (Sc,Zr) particles, the material was annealed at 300 • C for 8 hours -see [16] for details of the precipitates formation.…”

Section: Methodsmentioning

confidence: 99%

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The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

et al. 2018

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The Al-Mg-Sc-Zr alloys exhibit reasonable mechanical properties (e.g. corrosion resistance, weldability, superplasticity) for application in many branches of the industry. They owe their strength mainly to coherent particles of Al3Sc or Al3(Sc,Zr) phase which form during heat treatment at 300 • C. The influence of such particles on mechanical behaviour and microstructure evolution was studied on a twin-roll cast alloy which was subjected to deformation by equal channel angular pressing. Three types of processing of the material were compared: (1) only deformation, (2) deformation and heat treatment and (3) heat treatment and deformation. The deformation by equal channel angular pressing caused fragmentation of the original grains into micrometric grains and subgrains regardless of the presence of Al3(Sc,Zr) particles. The subsequent isochronal annealing with heating rate 50 K/50 min led to both softening and hardening of the material, dislocation recovery and recrystallization of the grain structure, the later was similar in all the studied materials

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 77%

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The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

et al. 2018

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“…As a next step all materials were subjected to annealing for 8 hours at 300 • C in order to form Al 3 (Sc,Zr) particles. The most suitable conditions for the precipitation annealing were found during the preceding research, see [20] for details.…”

Section: Methodsmentioning

confidence: 99%

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

et al. 2018

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The Al-Mg-Sc alloys are used in aerospace and shipbuilding industry due to their good mechanical properties such as corrosion resistance, weldability and possibility for superplastic forming. Addition of Sc with Zr may further lead to enhancement of their performance by precipitation of coherent particles of Al3(Sc,Zr) phase which are known to stabilize the microstructure and hinder the recrystallization. The role of the material processing on the microstructure and mechanical properties evolution was studied by means of transmission electron microscopy, scanning electron microscopy and resistivity measurement. The Al-Mg-Sc-Zr alloy was manufactured by two different manners-conventional casting and twin-roll casting and subjected to deformation by equal-channel angular pressing. The shape and nature of the grains significantly influenced precipitation of β-phase Al3Mg2, which may be detrimental for such kind of materials in the terms of corrosion resistance. The worst properties exhibited the conventionally cast and rolled material with a pancake grain structure where the β-phase particles forms as continuous layer along the (sub)grain boundaries.

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Influence of Microstructure in Near‐Surface Areas of Feedstocks on the Bond Strength of Roll Bonded Aluminum Clads

et al. 2020

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This work determines the impact of the different grain sizes and oxide layers in near‐surface areas of aluminum semi‐finished products on the bond strength after warm roll bonding. To adjust the grain microstructures in the initially twin‐roll cast feedstocks, they are differently treated to generate different grain sizes in the near‐surface areas. Semi‐finished products of the same near‐surface microstructure are then joined by warm roll‐bonding. In industrial applications, it is common to influence the bond strength of clads by applying a post heat treatment. Therefore, a part of the samples was annealed after warm roll bonding. Post‐treated samples with coarser grain size exhibit up to two times higher peel strength than untreated samples. Higher peel strengths of the post‐treated samples can be explained both by improved diffusion bonding due to heat exposure, and by recrystallization and grain coarsening of microstructure in the interface of sheets. Increase in peel strength of the composites made of feedstocks with coarser grains can be the result of stronger grain rotation, which damages oxide layer on the interface. To summarize, twin‐roll cast and soaked material with the coarsest grains in the near‐surface areas is the best feedstock for roll‐bonding, if an additional heat treatment is applied.

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The Influence of Annealing on Microstructure and Microhardness of Twin-roll Cast Al-Mg-Sc-Zr Alloy

Cited by 3 publications

References 19 publications

The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

Influence of Microstructure in Near‐Surface Areas of Feedstocks on the Bond Strength of Roll Bonded Aluminum Clads

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